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(No Model.) 3 Sheets-Sheet 1. J. G. SIMPSON 81; L. STOGKETT.

GOAL SCREEN. 7 No. 427,526. Patented May 6, 1890.

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GOAL SCREEN No. 427,526. Patented May 6,1890.

NoModeL-y 3 Sheets- 8119611 3.

A J. G. SIMPSON & L. STOOKETT.

COAL SGREEN.

Patented May 6, 1890.

Inf em 601 5 UNITED STATES PATENT OFFICE.

JAMES C. SIMPSON, OF ST. LOUIS, MISSOURI, AND LEVIS STOCKETT, OF

COLLINSVILLE, ILLINOIS.

COAL-SCREEN.

SPECIFICATION forming part of Letters Patent No. 427,526, dated May 6, 1890.

Application filed January '7, 1890- Serial No. 336,180. (No model.)

To aZZ. whom/it may concern.-

Be it known that we, JAMES C. SIMPSON, of St. Louis, Missouri, and Lnwrs STooKETr, of Oollinsville, Illinois, have jointly made a new and useful Improvement in Coal-Screens, of which the following is a full, clear, and exact description.

This improvement has for its object the more perfect screening and asserting of coal and other substances.

The invention consists of a table whose top is arranged horizontally or approximately so, and is of an open-work nature and largely composed of a system of rollers adapted to re- .volve in the same direction-namely, in the direction of the delivery end of the table and spaced laterally apart from each other to form vertical openings suited to the size of the particles or pieces of coal it is desired to have separated from the mass, and also havin g other openings of a similar nature and for a similar purpose between the successive rows of rollers, whereby the coal can be effectively screened and separated and borne along to its point of delivery in a manner which permits of the larger pieces of foreign matter being picked out from the mass While upon the table, all substantially as is hereinfter set forth and claimed, aided by the annexed drawings, making part of this specification, in whieh Figure 1 is a general view showing in side elevation the improved screen in position; Fig. 2, a plan,upon an enlarged scale, of the screen; Fig. 3, a vertical longitudinal section on the line 3 3 of Fig. 4:, which in turn is a plan upon a still larger scale of a portion of the screen.

The same letters of reference denote the same parts.

In Fig. 1, A represents the customary tower employed in hoisting the coal from the mine, and B the platform, upon which the coal is received in the usual manner and whence it is dumped onto the screening apparatus.

0 represents the improved screen. It is located at a suitable level and place, substantially as is represented in Fig. 1, to receive the coal from the platform B and to deliver it to the appointed receptacles-say the cars D E F. In the present instance the coal falls onto the chute G and thence onto the screen 0, and it is delivered from the screen onto the chutes H I J, which lead, respectively, to the cars D E F, as shown.

The screen,as stated, has various openings in it, through which a portion or portions of the mass of coal are allowed to drop, and its surface is partlyv composed of movable parts, whereby the coal delivered onto the screen is upheld and borne along the screen,and in its transit shaken and tumbled about and brought into many positions favorable for the elimination of the finer portion of the coal and for the separation of such portions thereof as may be desired, and also exposed to make it convenient for a bystander to pick out any undesirable lumps or pieces.

The movable parts referred to are preferably a system of rollers 0, adapted to rotate in the direction of the desired movement of the coal. The rollers are preferably arranged in rows 0' c, and the rollers of a row are applied to a shaft 0 to rotate therewith. The series of shafts c are j ournaled, as shown, in the side bars 0 0 which constitute the main part of the frame-Work of the screen, and the shaft, by any suitable means therefor, but not fully shown, as its nature is well understood, are all rotated in the same direction, so that the rollers 0 shall all revolve the same way. The rollers are spaced laterally apart to form spaces 0 between them for escape of that portion of the coal which is to be screened, and the successive rows 0' c of rollers are also spaced apart to form other spaces 0, extending transversely in the screen for the escape of the screened coal. Both of these spaces 0' and c are partly bounded by the bars 0, which are arranged transversely in the screen and supported from the side bars 0 0 substantially as shown. The bars 0 also serve to unite the side bars 0 c and form a framework for the screen. The bars 0 are in crosssection substantially triangular, and the rela tive arrangement of the rollers and bar, as also the relative arrangement of the two bars which are used between each row 0' and the next succeeding row 0 to form the spaces 0 is shown more distinctly in Fig. 3. The faces 0' c of two opposing bars are somewhat inclined to each other to form an enlargingspace to enable any pieces 76 of the coal K entering the space 0 to readily drop entirely through it.

The rollers c resemble disks, and they are conveniently spaced apart by providing them with hubs a which meet, as shown, when the rollers are strung upon the shaft 0 The rollers in diameter are sufficiently large to cause the distance between the hub a and the bar 0 to be greater than the width of the space 0 between adjoining rollers. The rollers at the sides thereof are also preferably dished, as shown at c", Fig. 4. These last-named features are for the purpose of providing ample clearance for those particles of the coal which fall between the rollers.

The operation of the improved screen is as follows: Motion being imparted to the rollers of the screen, as described, the coal is introduced upon the screen at the receiving end 0 thereof, and it is thence, by the action of the rollers, borne along in the direction of the delivery end 0 of the screen in the form of a thin layer. In the movement of the coal those particles thereof which are small enough drop through the described openings in the screen. Owing to the form which the mass of coal assumes upon the screen all portions of it are more directly exposed to the screen-openings than are they upon the ordinary screen, and a longer time is occupied in passing over the openings. Furthermore, the rollers operate to shake the pieces of coal, and in consequence the finer portion of the coal is more thoroughly separated from the remainder. This action of the rollers is supplemented by arranging the bars a, as shown, so that their tops are somewhat lower than the tops of the rollers. By this means an undulation is introduced into the movement of the coal and the pieces of the coal are thereby more or less shaken and tumbled about as they move along, and the finer particles are still more effectively separated.

Owing to the position-namely, a substantially horizontal oneof the screen and the displayed form of the coal thereupon attendants at the sides of the screen have opportunity for inspecting and reaching all parts of the material upon the screen and for removing foreign matter.

A single screen such as described may be used, or a series of the screens having, re-

spectively, openings of different sizes, according to the extent to which it is desired to separate the coal; or, as indicated in Figs. 1 and 2, the first portion 0 of the screen may have smaller openingssayone-half inehfor separating the slack, and the second portion e of the screen have larger openi1'igssay one inch-for separating the nut, leaving the lump-coal to be discharged over the delivery end of the screen.

We claim 1. The combination of the frame composed of the side bars 0 and the transverse bars 0 arranged in pairs, having the spaces 0 between them, the shafts 0 having bearings in the side bars 0 between the members of each of said pairs, and therollers mounted on and turning with said shafts, the peripheries of the rollers rising above the bars 0, substantially as specified.

2. The combination, with the frame composed of the side bars 0 and the transverse bars 0", arranged in pairs, having the spaces 0 between them, of the shafts having bearings in the side bars between the members of each of said pairs and the rollers mounted on and turning with said shafts, with their peripheries rising above the bars 0 and provided with hubs c, that abut against each other and form spaces between themselves and the adjacent bars 0 for pieces of coal to fall through, substantially as specified.

3. The combination, with the chute G, the frame composed of the side bars 0 and the transverse bars a, and the shafts c and rollers 0 between said bars, of the chute II at the discharge end of said frame and the two oppositely-inclined chutes I J below said frame, the bars 0 and rollers 0 being closer together over the chute J than over the chute I, and forming, therefore, a closer screen over the former, substantially as specified.

\Vitness our hands this th day of December, 1889.

JAMES C. SIMPSON. LEWIS STOCKETT. Vvitnesses:

O. D. MOODY,

THos. R. STooKETr, Jr. 

